US6771583B2ExpiredUtilityPatentIndex 52
Optical component
Est. expiryJan 19, 2021(expired)· nominal 20-yr term from priority
G11B 7/1374G11B 7/22
52
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Cited by
11
References
7
Claims
Abstract
In an optical lens used for a passing light having the maximum intensity on a wavelength (lambdaT) of 780±10 nm, an optical is made such that a reflection preventing coating is provided on both or at least one of a light-incident surface (S1) and a light-outgoing surface (S2) and the following conditional formula is satisfied: R2(lambdaR)>R1(lambdaR), where R1(lambdaR) and R2(lambdaR) are a reflectance of said respective surfaces for light having a wavelength (lambdaR) falling within a range from 500 to 700 nm.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. In an optical lens used for a passing light having the maximum intensity on a wavelength (λ T ) of 780±10 nm, a reflection preventing coating is provided on both or at least one of a light-incident surface (S 1 ) and a light-outgoing surface (S 2 ) and the following conditional formula is satisfied:
R 2 (λ R )> R 1 (λ R ),
where R 1 (λ R ) and R 2 (λ R ) are a reflectance of said respective surfaces for light having a wavelength (λ R ) falling within a range from 500 to 700 nm.
2. In an optical lens used for a passing light having the maximum intensity on a wavelength (λ T ) within a range of 600 to 700 nm, a reflection preventing coating is provided on both or at least one of a light-incident surface (S 1 ) and a light-outgoing surface (S 2 ) and the following inequality is satisfied:
R 2 (λ R )> R 1 (λ R ),
where R 1 (λ R ) and R 2 (λ R ) are a reflectance of said respective surfaces for light having a wavelength (λ R ) falling within a range from 750 to 850 nm.
3. In an optical lens used for a passing light having the maximum intensity on a wavelength (λ T ) within a range of 350 to 500 nm, a reflection preventing coating is provided on both or at least one of a light-incident surface (S 1 ) and a light-outgoing surface (S 2 ) and the following inequality is satisfied:
R 2 (λ R )> R 1 (λ R ),
where R 1 (λ R ) and R 2 (λ R ) are a reflectance of said respective surfaces for light having a wavelength (λ R ) falling within a range from 500 to 800 nm.
4. The optical lens as set forth in any one of claims 1 to 3 , wherein the reflectance R 2 (λ R ) of the light-outgoing surface (S 2 ) for light having the wavelength (λ R ) is made 5% or more.
5. An optical pickup device for conducting recording or reproducing an optical information recording medium, comprising:
a light source to emit light flux having a predetermined wavelength falling within a range of 780±10 nm; and
a converging optical system having an optical lens, wherein said optical lens satisfies the following conditional formula:
R 2 (λ R )> R 1 (λ R ),
Where R 1 (λ R ) is a reflectance of a light-incident surface of said optical lens for light flux having a wavelength (λ R ) falling within a range from 500 to 700 nm, and R 2 (λ R ) is a reflectance of a light-outgoing surface of said optical lens for light flux having a wavelength (λ R ) falling within a range from 500 to 700 nm.
6. An optical pickup device for conducting recording or reproducing an optical information recording medium, comprising:
a light source to emit light flux having a predetermined wavelength falling within a range of 600 to 700 nm; and
a converging optical system having an optical lens, wherein said optical lens satisfies the following conditional formula:
R 2 (λ R )> R 1 (λ R ),
Where R 1 (λ R ) is a reflectance of a light-incident surface of said optical lens for light flux having a wavelength (λ R ) falling within a range from 750 to 800 nm, and R 2 (λ R ) is a reflectance of a light-outgoing surface of said optical lens for light flux having a wavelength (λ R ) falling within a range from 750 to 800 nm.
7. An optical pickup device for conducting recording or reproducing an optical information recording medium, comprising:
a light source to emit light flux having a predetermined wavelength falling within a range of 350 to 500 nm; and
a converging optical system having an optical lens, wherein said optical lens satisfies the following conditional formula:
R 2 (λ R )> R 1 (λ R ),
Where R 1 (λ R ) is a reflectance of a light-incident surface of said optical lens for light flux having a wavelength (λ R ) falling within a range from 500 to 800 nm, and R 2 (λ R ) is a reflectance of a light-outgoing surface of said optical lens for light flux having a wavelength (λ R ) falling within a range from 500 to 800 nm.Cited by (0)
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